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Early stereo viewer embossed on leather covered lid, "Loyd's American Stereoscope, Patented April 15th, 1856".
Stereographica - Antique Photographica
Courtesy of Bryan and Page Ginns (#14 / 22)
The interior has slots for views that can be placed at various distances from the lens to achieve optimum focus. The slots can also be used to store the views. Exterior of viewer measures 7.5" x 5.5" x 4.5". Refer Wing, pages 56/57 for more information and illustrations of similar stereoscopes.